William cayce



,i UNITEDSTATES PATENT OFFICE WILLIAM oAYoE, or FRANKLIN, TENNESSEE.

Doon-Loox.

Specicationoflietters :Patent No.V 11,4112, dated August 1, 1854.

l. To all whom t may concern.' l

fao

Be itknown that I, IVILLIAM Circ-E, of-

Franklin, in Williamson county and Stateof Tennessee, have invented certainnew and useful Improvements in Door-Locks; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, and to letters of reference marked there on, inwhich-fj Figure `1, is an isometrical perspective of the interior of the lock. Fig. 2,. isa vertical transverse section, `taken through `the key hole. Fig. 3, is a side View `of the key, part in `section and part in elevation, the bit being extended tothe position it assumes, when insert-ed in the lock, it is also shown in red lines in its position when out lof the lock. Fig. 4, is an edge view of the key, the bit being in the same position sh'own in red lines in Fig. 3. Fig. 5, is a sectional View, of another Inode of constructing t-he key. Fig. 6, is a View of the exterior of the same, when out of the lock.

The same letters of reference, appearing in different figures, indicate corresponding parts.

In the accompanying drawing, (R) represents the rim of the lock, (C) the bolt, which is madesufliciently broad, to admit of the two tumblers or pawls (E E) locking into the grooves (D), (on the utop `of the bolt,) side by side, these pawls are hung on a pin (a), extending from side to side of the case, and are borne down by the springs (F, F,) one on each, and acting independently of each other; the pawls are operated through the elbow levers (G),`having their fulcrumon `the pin (Z9) extending fromside to side of the case; one of theselevers ex` tendsat one end, under the tube which forms the key hole,and protrudes a short distance into the lock, to serve asa guard to said lever, while a similar protrusion on the inside of the loose plate (I), forming the key hole frointhe other side `of the lock, lguards the other lever` in like manner, the other ends of these levers, extend u ward, one on either side of the bolt, with lips (Z) at their extremity turning under the pawls (E), and by-which the pawls are raised, by depressing the ends of the levers under the key hole, which causes thelips at their upper end, to slide against the inclined planes on the under side of the pawls; the levers as well as the pawls, actingindependently of each other, must be operated simultaneously in order to release the bolt, that it may be shot forward orbackward, as the case may be, by the ordinary act-ion of a key.

The shank (K) of the key, is cylindrical,

and is slotted near t-he end, to admit of the bit (e) closing in parallel with the shank;

the bit is pivoted in saidslot at (i), and is operated to throw `it outward, or atright angle to the shank, by a sliding forked spring` f) ,which hooks onto a stub on each side ofthe bit, and extends alongone side ofthe shank, either lin a groove or on a Hat,

to the inside of the bow, where it terminates with a thumb button (m), for the convenience of pressing it downward, to throw the bit into the parallel position indicated by red lines in Fig. 3, in order to extract the key from the lock; said spring is also provided with a projection at (g), which, when the key is inserted in the lock, presses against the end' of the tube (H) which forms the key hole, and draws the bit to the angular position shown in Fig. 3, in turning the key when in this position in the lock, the short T formed end of the bit, projects under the tubes of the key hole on each side, and depresses both the levers, which raise the p-awls as before described, while the bolt is moved by the opposite end of the bit, outward or inward as required.

VVhenthe bit is closed to its position parallel with the shank, it projects at either side, slightly beyond the shank; to admit of these projections, the key hole is grooved on each side at (B) there is also a projection on one side of the shank, at right angles tothe projections formed by the bit, this passes `in a groove (B) in the lower side of the key hole, on one side of the lock, and in the upper side, on the other side of the lock, to insure the key being inserted right side upward.

Another manner of making the key, is by inclosing the shank in a cylinder, which is forced down over the bit, when it is in it-s parallel position, by a spring around the shank, which is also inclosedby another cylinder, made fast to the bow of the key; the sliding` cylinder, is made with a beador collar (s) around it, which presses against the end of the key hole tube, when the key is pressed into the lock, and acts upon the bit to turn it outward,`by a projection inside of said cylinder, which catches onto the fork (f), 'ata proper distance to give it the re-` quired motion, to throw the bit out at right vangles to the shank.

Beneath the key hole inside the lock, I arrange two inclined planes (o), one overlapping t-he other, and inclining toward a l hole in the riln of the lock; the object of them, being to prevent the possibility, of blowing the lock up with gun powder, which,

if poured in at the key hole, would fall onthe inclined planes, and discharge through the holel (p), without leaving agrain in the lock, while the overlapping of the inclins would prevent lire, in almost any form from, following the powder through the hole (p) to its resting pla-ce, consequently it would be harmless.

- The peculiar advantages of this lock, are that the levers which operate the pawls, are

' secreted under the key hole tubes, and the pawls or tumblers above the bolt, which being duplicated, and required to operate simultaneously with each other, and with the bolt, are all inaccessible, by any instrument that could be introduced through the key hole, other than the hinged key herein described; while the arrangement of the inclined planes, and discharge aperture, precludes the possibility, of blowing the lock up with gun powder.

What I claim as new, and desire to secure WM. CAYCE. l/Vitnesses:

JOHN -CHRISTLEY, JAMES P. PARTEN. 

